JP7178809B2 - spindle motor - Google Patents

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JP7178809B2
JP7178809B2 JP2018119878A JP2018119878A JP7178809B2 JP 7178809 B2 JP7178809 B2 JP 7178809B2 JP 2018119878 A JP2018119878 A JP 2018119878A JP 2018119878 A JP2018119878 A JP 2018119878A JP 7178809 B2 JP7178809 B2 JP 7178809B2
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shaft member
conical bearing
conical
bearing member
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JP2020002957A (en
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秀明 昭和
大吾 中嶌
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MinebeaMitsumi Inc
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Description

本発明は、スピンドルモータに関する。 The present invention relates to spindle motors.

スピンドルモータにおいては、軸ユニットの円錐軸受部材が軸部材に隙間嵌めされており、レーザ溶接により円錐軸受部材と軸部材とが固定されているものがある（例えば、特許文献１参照）。 In some spindle motors, the conical bearing member of the shaft unit is loosely fitted to the shaft member, and the conical bearing member and the shaft member are fixed by laser welding (see, for example, Patent Document 1).

特開２００６－７７８２５号公報JP 2006-77825 A

ハードディスク駆動装置は、記憶容量の増加を図るために筐体の内部空間にヘリウム等のガスが封入され、ディスクの積層数が増加している。このハードディスク装置に、円錐軸受部材による流体動圧軸受を備えたスピンドルモータを用いる場合には、ディスクの積層数が増加するのに伴い、円錐軸受部材と軸部材との間において外部衝撃に対する耐力を向上することが必要となる。 2. Description of the Related Art In order to increase the storage capacity of a hard disk drive, gas such as helium is sealed in the internal space of the housing, and the number of laminated disks is increasing. When a spindle motor equipped with a fluid dynamic pressure bearing using a conical bearing member is used in this hard disk drive, as the number of stacked disks increases, the resistance to external impact between the conical bearing member and the shaft member increases. need to improve.

そこで、円錐軸受部材と軸部材とを圧入により固定することが考えられる。しかしながら、強く圧入し過ぎた場合には、円錐軸受部材が変形し、スピンドルモータの回転駆動時には振動を生ずるおそれがある。 Therefore, it is conceivable to fix the conical bearing member and the shaft member by press-fitting. However, if the press-fitting is too strong, the conical bearing member may be deformed and may vibrate when the spindle motor is driven to rotate.

本発明の目的は、円錐軸受部材の変形を防止しつつ、円錐軸受部材と軸部材との間の締結強度を向上することができる技術を提供することにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide a technique capable of improving the fastening strength between a conical bearing member and a shaft member while preventing deformation of the conical bearing member.

本発明の一態様に係るスピンドルモータは、ベースプレートに固定された軸部材と、軸方向一端側に向かって内径が拡大する円錐内面を有して前記軸部材が挿通された貫通孔を備えるロータ部材と、前記円錐内面と対向する円錐外面を有して前記軸部材に固定された円錐軸受部材と、前記円錐内面と前記円錐外面との少なくともいずれかに形成された動圧溝と、前記円錐内面と前記円錐外面との隙間に充填された潤滑油と、前記軸方向一端側で前記円錐軸受部材に当接して固定された抜け止め部材とを備えることを特徴とする。 A spindle motor according to an aspect of the present invention is a rotor member comprising a shaft member fixed to a base plate and a through hole having a conical inner surface whose inner diameter increases toward one end in the axial direction and through which the shaft member is inserted. a conical bearing member fixed to the shaft member and having a conical outer surface facing the conical inner surface; dynamic pressure grooves formed in at least one of the conical inner surface and the conical outer surface; and the conical inner surface and lubricating oil filled in a gap between the conical outer surface and the retaining member fixed in contact with the conical bearing member on the axial one end side.

本発明に係るスピンドルモータによれば、円錐軸受部材の変形を防止しつつ、円錐軸受部材と軸部材との間の締結強度を向上することができる。 According to the spindle motor of the present invention, it is possible to improve the fastening strength between the conical bearing member and the shaft member while preventing deformation of the conical bearing member.

本発明の実施の形態に係るハードディスク駆動装置の概略構成を示すための斜視図である。1 is a perspective view showing a schematic configuration of a hard disk drive according to an embodiment of the invention; FIG. 図１に示すスピンドルモータの構成を概略的に示す断面図である。FIG. 2 is a cross-sectional view schematically showing the configuration of the spindle motor shown in FIG. 1; 図２に示すスピンドルモータの上側の部分の構成を概略的に示す部分拡大断面図である。3 is a partially enlarged cross-sectional view schematically showing the configuration of the upper portion of the spindle motor shown in FIG. 2; FIG. 図２に示すスピンドルモータの上側の部分の変形例の構成を概略的に示す部分拡大断面図である。3 is a partially enlarged cross-sectional view schematically showing a modified configuration of the upper portion of the spindle motor shown in FIG. 2; FIG. 図２に示すスピンドルモータの上側の部分の変形例の構成を概略的に示す部分拡大断面図である。3 is a partially enlarged cross-sectional view schematically showing a modified configuration of the upper portion of the spindle motor shown in FIG. 2; FIG. 図２に示すスピンドルモータの上側の部分の変形例の構成を概略的に示す部分拡大断面図である。3 is a partially enlarged cross-sectional view schematically showing a modified configuration of the upper portion of the spindle motor shown in FIG. 2; FIG. 図２に示すスピンドルモータの上側の部分の変形例の構成を概略的に示す部分拡大断面図である。3 is a partially enlarged cross-sectional view schematically showing a modified configuration of the upper portion of the spindle motor shown in FIG. 2; FIG.

以下、本発明の実施の形態について図面を参照しながら説明する。 BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は、本発明の実施の形態に係るスピンドルモータ１が適用されたハードディスク駆動装置１００の概略構成を示すための斜視図である。ハードディスク駆動装置１００において、スピンドルモータ１がハウジング１０１の底部１０１ａに固定又は形成されており、スピンドルモータ１は磁気ディスク１０２を回転可能に支持している。カバー（図示せず）とハウジング１０１とにより、ハードディスク駆動装置１００の筐体が形成される。カバー（図示せず）とハウジング１０１とにより形成される内部の空間Ｓには、例えばヘリウム等の空気よりも軽いガスが充填されている。 FIG. 1 is a perspective view showing a schematic configuration of a hard disk drive device 100 to which a spindle motor 1 according to an embodiment of the invention is applied. In a hard disk drive 100, a spindle motor 1 is fixed or formed on a bottom portion 101a of a housing 101, and the spindle motor 1 supports a magnetic disk 102 rotatably. A cover (not shown) and housing 101 form a housing for hard disk drive 100 . An internal space S formed by a cover (not shown) and the housing 101 is filled with a gas lighter than air, such as helium.

ハードディスク駆動装置１００では、軸受装置１０３により揺動可能に支持されているスイングアーム１０４の先端に配置された磁気ヘッド１０５が、回転している磁気ディスク１０２上を移動する。これにより、磁気ディスク１０２に情報を記録し、また、磁気ディスク１０２に記録されている情報を読み出すことができる。 In the hard disk drive 100, a magnetic head 105 arranged at the tip of a swing arm 104 swingably supported by a bearing device 103 moves above the rotating magnetic disk 102. FIG. Thus, information can be recorded on the magnetic disk 102 and information recorded on the magnetic disk 102 can be read.

図２は、図１に示すスピンドルモータ１の構成を概略的に示す断面図であり、図３は、図２に示すスピンドルモータ１の上側の部分の構成を概略的に示す部分拡大断面図である。以下、説明の便宜上、図２におけるスピンドルモータ１の軸Ｙ１の方向（以下、軸方向ともいう）における一方（矢印ａ方向）を上側とし、他方（矢印ｂ方向）を下側とする。また、図２におけるスピンドルモータ１の軸Ｙ１に直交して延在する半径方向における一方（矢印ｃ方向）を内周側とし、他方（矢印ｄ方向）を外周側とする。以下の説明において、各部材の位置関係や方向を上下を用いて説明するときは、あくまで図面における位置関係や方向を示し、実際の機器に組み込まれたときの位置関係や方向を示すものではない。 2 is a cross-sectional view schematically showing the configuration of the spindle motor 1 shown in FIG. 1, and FIG. 3 is a partially enlarged cross-sectional view schematically showing the configuration of the upper portion of the spindle motor 1 shown in FIG. be. Hereinafter, for convenience of explanation, one side (direction of arrow a) in the direction of the axis Y1 of the spindle motor 1 in FIG. In addition, one side (the direction of arrow c) in the radial direction extending perpendicular to the axis Y1 of the spindle motor 1 in FIG. In the following explanation, when the positional relationship and direction of each member are described using the top and bottom, the positional relationship and direction in the drawings are shown to the last, and the positional relationship and direction when incorporated in an actual device are not shown. .

本発明の実施の形態に係るスピンドルモータ１は、ベースプレート１１に固定された軸部材２１と、軸方向一端側（上側（矢印ａ方向）又は下側（矢印ｂ方向））に向かって内径が拡大する円錐内面３１ｄを有して軸部材２１が挿通された貫通孔３１ａを備えるロータ部材（ロータ３０）と、円錐内面３１ｄと対向する円錐外面（下側円錐外面２２ａｂ，上側円錐外面２２ｂｕ）を有して軸部材２１に固定された円錐軸受部材（上側円錐軸受部材２２ａ，下側円錐軸受部材２２ｂ）とを備えている。また、スピンドルモータ１は、円錐内面３１ｄと円錐外面（下側円錐外面２２ａｂ，上側円錐外面２２ｂｕ）との少なくともいずれかに形成された動圧溝Ｄと、円錐内面３１ｄと円錐外面（下側円錐外面２２ａｂ，上側円錐外面２２ｂｕ）との隙間に充填された潤滑油Ｇと、軸方向一端側（上側（矢印ａ方向）又は下側（矢印ｂ方向））で円錐軸受部材（上側円錐軸受部材２２ａ，下側円錐軸受部材２２ｂ）に当接して固定された抜け止め部材（上側抜け止め部材２３ａ，下側抜け止め部材２３ｂ）とを備えている。以下、スピンドルモータ１の構成について具体的に説明する。 A spindle motor 1 according to the embodiment of the present invention includes a shaft member 21 fixed to a base plate 11 and an inner diameter that expands toward one axial end side (upward (arrow a direction) or downward (arrow b direction)). A rotor member (rotor 30) having a conical inner surface 31d and a through hole 31a through which the shaft member 21 is inserted, and conical outer surfaces (lower conical outer surface 22ab, upper conical outer surface 22bu) facing the conical inner surface 31d Conical bearing members (upper conical bearing member 22a, lower conical bearing member 22b) fixed to the shaft member 21 are provided. Further, the spindle motor 1 includes a dynamic pressure groove D formed in at least one of the conical inner surface 31d and the conical outer surface (the lower conical outer surface 22ab, the upper conical outer surface 22bu), the conical inner surface 31d and the conical outer surface (the lower conical The lubricating oil G filled in the gap between the outer surface 22ab and the upper conical outer surface 22bu) and the conical bearing member (upper conical bearing member 22a , lower conical bearing member 22b) and retainer members (upper retainer member 23a, lower retainer member 23b). The configuration of the spindle motor 1 will be specifically described below.

スピンドルモータ１は、図２に示すように、ステータ１０と、軸ユニット２０と、ロータ３０とを有している。ステータ１０は、ベースプレート１１と、ベースプレート１１に固定されたステータコア１２とを有している。ベースプレート１１には、後述する軸部材２１の下部を挿通して固定するための貫通孔１１ａと、貫通孔１１ａと同心の円周壁部１１ｂとが形成されている。また、円周壁部１１ｂの外周面にはステータコア１２が固定され、ステータコア１２にはコイル１３が巻回されている。 The spindle motor 1 has a stator 10, a shaft unit 20, and a rotor 30, as shown in FIG. The stator 10 has a base plate 11 and a stator core 12 fixed to the base plate 11 . The base plate 11 is formed with a through hole 11a for inserting and fixing a lower portion of a shaft member 21, which will be described later, and a circumferential wall portion 11b concentric with the through hole 11a. A stator core 12 is fixed to the outer peripheral surface of the circumferential wall portion 11b, and a coil 13 is wound around the stator core 12. As shown in FIG.

軸ユニット２０は、軸部材２１と、軸部材２１に挿通された上側円錐軸受部材２２ａ及び下側円錐軸受部材２２ｂと、上側円錐軸受部材２２ａ及び下側円錐軸受部材２２ｂと軸方向（矢印ａｂ方向）において当接しており、軸部材２１に固定された上側抜け止め部材２３ａ及び下側抜け止め部材２３ｂとを有している。上側抜け止め部材２３ａ及び下側抜け止め部材２３ｂにより上側円錐軸受部材２２ａ及び下側円錐軸受部材２２ｂにおける軸方向（矢印ａｂ方向）の移動が規制されている。軸ユニット２０は、例えば、コニカル動圧軸受（流体動圧軸受）である。軸部材２１は、略円筒状に形成されており、例えばマルテンサイト系ステンレス鋼であるＳＵＳ４４０Ｃで形成されている。軸部材２１の内部には、軸部材２１の下面から軸方向（矢印ａｂ方向）に延びる軸孔２１ａが形成されている。 The shaft unit 20 includes a shaft member 21, an upper conical bearing member 22a and a lower conical bearing member 22b inserted through the shaft member 21, an upper conical bearing member 22a and a lower conical bearing member 22b, and an axial direction (arrow ab direction). ), and has an upper retaining member 23a and a lower retaining member 23b fixed to the shaft member 21. As shown in FIG. The movement of the upper conical bearing member 22a and the lower conical bearing member 22b in the axial direction (arrow ab direction) is restricted by the upper retaining member 23a and the lower retaining member 23b. The shaft unit 20 is, for example, a conical dynamic pressure bearing (fluid dynamic pressure bearing). The shaft member 21 is formed in a substantially cylindrical shape, and is made of, for example, SUS440C, which is martensitic stainless steel. Inside the shaft member 21, a shaft hole 21a is formed extending from the lower surface of the shaft member 21 in the axial direction (arrow ab direction).

軸部材２１は、ロータ３０のロータ部材３１に形成された貫通孔３１ａに挿通されている。また、軸部材２１の下部は、ベースプレート１１に形成された貫通孔１１ａに挿入され、圧入、または圧入及び接着により固定されている。上側円錐軸受部材２２ａ及び下側円錐軸受部材２２ｂは、軸部材２１の周囲を取り囲むように設けられており、例えばオーステナイト系ステンレス鋼であるＳＵＳ３０３により形成されている。軸部材２１、上側円錐軸受部材２２ａ及び下側円錐軸受部材２２ｂ、並びに上側抜け止め部材２３ａ及び下側抜け止め部材２３ｂの具体的な構成については後述する。 The shaft member 21 is inserted through a through hole 31 a formed in the rotor member 31 of the rotor 30 . A lower portion of the shaft member 21 is inserted into a through hole 11a formed in the base plate 11 and fixed by press-fitting or press-fitting and adhesion. The upper conical bearing member 22a and the lower conical bearing member 22b are provided so as to surround the shaft member 21, and are made of SUS303, which is austenitic stainless steel, for example. Specific configurations of the shaft member 21, the upper conical bearing member 22a, the lower conical bearing member 22b, the upper retaining member 23a, and the lower retaining member 23b will be described later.

ロータ３０は、ロータ部材３１と、ヨーク３２と、ロータマグネット３３と、エンドキャップ３４とを有している。ロータ部材３１は、略円筒状に形成されており、例えばアルミニウム合金Ａ６０６１－Ｔ６で形成されている。また、ロータ部材３１には、軸部材２１を挿通するための貫通孔３１ａと、２つの動圧溝部３１ｂと、ヨーク取付部３１ｃとが形成されている。ヨーク取付部３１ｃには、ヨーク３２を介してロータマグネット３３が固定されている。ロータマグネット３３は、永久磁石からなり、ステータコア１２に対向して配置されている。 The rotor 30 has a rotor member 31 , a yoke 32 , a rotor magnet 33 and an end cap 34 . The rotor member 31 is formed in a substantially cylindrical shape, and is made of aluminum alloy A6061-T6, for example. Further, the rotor member 31 is formed with a through hole 31a for inserting the shaft member 21, two dynamic pressure groove portions 31b, and a yoke mounting portion 31c. A rotor magnet 33 is fixed via the yoke 32 to the yoke mounting portion 31c. The rotor magnet 33 is made of a permanent magnet and arranged to face the stator core 12 .

動圧溝部３１ｂは、貫通孔３１ａの外周側（矢印ｄ方向）であって、上側円錐軸受部材２２ａ及び下側円錐軸受部材２２ｂと対向する位置に形成されている。動圧溝部３１ｂには、動圧を発生させるための動圧溝Ｄが形成されている。この動圧溝Ｄは、例えば、ロータ部材３１において貫通孔３１ａの上側（矢印ａ方向）及び下側（矢印ｂ方向）に設けられた円錐内面３１ｄに電解加工を施すことにより形成することが可能である。また、円錐内面３１ｄと、上側円錐軸受部材２２ａの下側（矢印ｂ方向）の外周面である下側円錐外面２２ａｂ及び下側円錐軸受部材２２ｂの上側（矢印ａ方向）の外周面である上側円錐外面２２ｂｕとは、微小な隙間（図示省略）を隔てて対向している。なお、動圧溝Ｄは、円錐内面３１ｄではなく、上側円錐軸受部材２２ａの下側円錐外面２２ａｂ及び下側円錐軸受部材２２ｂの上側円錐外面２２ｂｕに形成されていてもよく、いずれかに形成されていればよい。 The dynamic pressure groove portion 31b is formed on the outer peripheral side (direction of arrow d) of the through hole 31a and at a position facing the upper conical bearing member 22a and the lower conical bearing member 22b. A dynamic pressure groove D for generating dynamic pressure is formed in the dynamic pressure groove portion 31b. The dynamic pressure grooves D can be formed, for example, by electrochemically machining conical inner surfaces 31d provided above (in the direction of arrow a) and below (in the direction of arrow b) the through hole 31a of the rotor member 31. is. In addition, a conical inner surface 31d, a lower conical outer surface 22ab that is the outer peripheral surface of the lower side (arrow b direction) of the upper conical bearing member 22a, and an upper side that is the outer peripheral surface of the upper side (arrow a direction) of the lower conical bearing member 22b. It faces the conical outer surface 22bu with a small gap (not shown) therebetween. The dynamic pressure groove D may be formed on the lower conical outer surface 22ab of the upper conical bearing member 22a and the upper conical outer surface 22bu of the lower conical bearing member 22b instead of the conical inner surface 31d. It is good if there is

上側円錐軸受部材２２ａの下側円錐外面２２ａｂに対向する円錐内面３１ｄは、ロータ部材３１の貫通孔３１ａの上側（矢印ａ方向）に向かって内径が拡大している。下側円錐軸受部材２２ｂの上側円錐外面２２ｂｕに対向する円錐内面３１ｄは、ロータ部材３１の貫通孔３１ａの下側（矢印ｂ方向）に向かって内径が拡大している。円錐内面３１ｄと上側円錐軸受部材２２ａの下側円錐外面２２ａｂ及び下側円錐軸受部材２２ｂの上側円錐外面２２ｂｕとの間の微小な隙間には潤滑油Ｇが充填されている。 A conical inner surface 31d facing the lower conical outer surface 22ab of the upper conical bearing member 22a has an inner diameter that increases upward (in the direction of arrow a) of the through hole 31a of the rotor member 31 . A conical inner surface 31d facing the upper conical outer surface 22bu of the lower conical bearing member 22b has an inner diameter that expands toward the lower side of the through hole 31a of the rotor member 31 (in the direction of arrow b). A lubricating oil G is filled in minute gaps between the conical inner surface 31d and the lower conical outer surface 22ab of the upper conical bearing member 22a and the upper conical outer surface 22bu of the lower conical bearing member 22b.

エンドキャップ３４は、ロータ部材３１に固定される部材である。エンドキャップ３４と軸部材２１との間には、エンドキャップ３４によってロータ部材３１の回転を妨げられないように、微小な隙間が形成されている。エンドキャップ３４は、接着、又は接着及び圧入によって、ロータ部材３１に固定されている。 The end cap 34 is a member fixed to the rotor member 31 . A minute gap is formed between the end cap 34 and the shaft member 21 so that the rotation of the rotor member 31 is not hindered by the end cap 34 . The end cap 34 is fixed to the rotor member 31 by gluing or gluing and press fitting.

ロータ３０に固定されたロータマグネット３３と、ステータ１０に固定されたステータコア１２とは、微小な隙間を挟んで対向している。そして、ステータ１０の複数のコイル１３に位相の異なる駆動電流を流すと回転磁界が発生し、この回転磁界によってロータマグネット３３に回転力が発生する。これにより、ロータ３０がステータ１０及び軸ユニット２０に対して回転する。 The rotor magnet 33 fixed to the rotor 30 and the stator core 12 fixed to the stator 10 face each other across a minute gap. When drive currents having different phases are supplied to the plurality of coils 13 of the stator 10, a rotating magnetic field is generated, and a rotating force is generated in the rotor magnet 33 by this rotating magnetic field. Thereby, the rotor 30 rotates with respect to the stator 10 and the shaft unit 20 .

また、ロータ３０が軸ユニット２０に対して回転すると、動圧溝部３１ｂに設けられた動圧溝（図示省略）により、ロータ３０の円錐内面３１ｄと、軸ユニット２０の上側円錐軸受部材２２ａの下側円錐外面２２ａｂ及び上側円錐軸受部材２２ａの上側円錐外面２２ｂｕとを離間させる動圧が発生する。これにより、円錐内面３１ｄと下側円錐外面２２ａｂ及び上側円錐外面２２ｂｕとが非接触状態で支持される。そして、円錐内面３１ｄと下側円錐外面２２ａｂ及び上側円錐外面２２ｂｕとが非接触状態で支持されることにより、ロータ３０は、軸ユニット２０及び軸ユニット２０が固定されたステータ１０に対して自在に回転する。 Further, when the rotor 30 rotates with respect to the shaft unit 20, the dynamic pressure groove (not shown) provided in the dynamic pressure groove portion 31b causes the conical inner surface 31d of the rotor 30 and the bottom of the upper conical bearing member 22a of the shaft unit 20 to move. A dynamic pressure is generated to separate the side conical outer surface 22ab and the upper conical outer surface 22bu of the upper conical bearing member 22a. Thereby, the conical inner surface 31d, the lower conical outer surface 22ab, and the upper conical outer surface 22bu are supported in a non-contact state. By supporting the conical inner surface 31d, the lower conical outer surface 22ab, and the upper conical outer surface 22bu in a non-contact state, the rotor 30 can be freely moved with respect to the shaft unit 20 and the stator 10 to which the shaft unit 20 is fixed. Rotate.

スピンドルモータ１において、軸部材２１は、図３に示すように、軸部材２１の外周側（矢印ｄ方向）の面である外周面２１ｘから内周側（矢印ｃ方向）に凹む周溝２４を有している。上側円錐軸受部材２２ａは、軸部材２１が挿通され、軸方向一端側（上側（矢印ａ方向））に拡径部（段部２５ａ）を有する軸受貫通孔２５を備え、上側抜け止め部材２３ａは、拡径部（段部２５ａ）に収容されている。すなわち、上側円錐軸受部材２２ａは、上側円錐軸受部材２２ａの内周側（矢印ｃ方向）において上側円錐軸受部材２２ａの一方側（上側（矢印ａ方向））を臨む面（上面２２ｕ）から他方側（下側（矢印ｂ方向））に凹む段部２５ａを有している。 In the spindle motor 1, the shaft member 21, as shown in FIG. have. The upper conical bearing member 22a is provided with a bearing through-hole 25 through which the shaft member 21 is inserted and having an enlarged diameter portion (stepped portion 25a) on one axial end side (upper side (arrow a direction)). , is accommodated in the enlarged diameter portion (stepped portion 25a). That is, the upper conical bearing member 22a extends from a surface (upper surface 22u) facing one side (upper side (arrow a direction)) of the upper conical bearing member 22a on the inner peripheral side (arrow c direction) of the upper conical bearing member 22a to the other side. It has a stepped portion 25a recessed downward (in the direction of arrow b).

具体的に、軸部材２１の周溝２４は、軸部材２１の上側（矢印ａ方向）の端部である上側端部２１ｕにおいて、軸部材２１の外周面２１ｘから内周側（矢印ｃ方向）に向かって円環状に凹んでいる。軸部材２１の周溝２４は、軸部材２１の外周面２１ｘから内周側（矢印ｃ方向）おける所定の深さの位置に軸Ｙ１を中心として軸方向（矢印ａｂ方向）に沿って延びる円筒状の面である底面２４ｔを有している。底面２４ｔは、周溝２４の内周側（矢印ｃ方向）の境界を画成している。 Specifically, the circumferential groove 24 of the shaft member 21 extends toward the inner circumference (arrow c direction) from the outer peripheral surface 21x of the shaft member 21 at the upper end portion 21u that is the upper end (arrow a direction) of the shaft member 21. It is circularly recessed toward the The circumferential groove 24 of the shaft member 21 is a cylinder extending in the axial direction (arrow ab direction) about the axis Y1 at a predetermined depth on the inner circumferential side (arrow c direction) from the outer peripheral surface 21x of the shaft member 21. It has a bottom surface 24t which is a shaped surface. The bottom surface 24t defines the boundary of the circumferential groove 24 on the inner circumferential side (direction of arrow c).

周溝２４の底面２４ｔの上側（矢印ａ方向）には上面２４ｕが形成されており、周溝２４の底面２４ｔの下側（矢印ｂ方向）には下面２４ｂが形成されている。周溝２４の上面２４ｕは、周溝２４の上側（矢印ａ方向）の境界を画成する面であり、周溝２４の下面２４ｂは、周溝２４の下側（矢印ｂ方向）の境界を画成する面である。 An upper surface 24u is formed above the bottom surface 24t of the circumferential groove 24 (in the direction of arrow a), and a lower surface 24b is formed below the bottom surface 24t of the circumferential groove 24 (in the direction of arrow b). The upper surface 24u of the circumferential groove 24 defines the boundary on the upper side (direction of arrow a) of the circumferential groove 24, and the lower surface 24b of the circumferential groove 24 defines the boundary on the lower side (direction of arrow b) of the circumferential groove 24. It is the surface that defines.

周溝２４の上面２４ｕは、底面２４ｔの上側（矢印ａ方向）の縁から外周側（矢印ｄ方向）に半径方向（矢印ｃｄ方向）に沿って延びる軸Ｙ１を中心とする円環状の面であり、周溝２４の下面２４ｂは、底面２４ｔの下側（矢印ｂ方向）の縁から外周側（矢印ｄ方向）に半径方向（矢印ｃｄ方向）に沿って延びる軸Ｙ１を中心とする円環状の面である。なお、周溝２４の上面２４ｕは、底面２４ｔの上側（矢印ａ方向）の縁から外周側（矢印ｄ方向）に向かうにつれて上側（矢印ａ方向）に傾いて延びていてもよい。 The upper surface 24u of the circumferential groove 24 is an annular surface centered on the axis Y1 extending radially (in the direction of the arrow cd) from the upper edge (in the direction of the arrow a) of the bottom surface 24t to the outer peripheral side (in the direction of the arrow d). The lower surface 24b of the circumferential groove 24 has an annular shape centered on an axis Y1 extending radially (in the direction of arrow cd) from the lower edge (in the direction of arrow b) of the bottom surface 24t toward the outer periphery (in the direction of arrow d). is the aspect of The upper surface 24u of the circumferential groove 24 may extend upward (in the direction of arrow a) from the upper edge (in the direction of arrow a) of the bottom surface 24t toward the outer periphery (in the direction of arrow d).

上側円錐軸受部材２２ａの段部２５ａには、上側円錐軸受部材２２ａの上側（矢印ａ方向）の面である上面２２ｕよりも下側（矢印ｂ方向）において軸Ｙ１を中心として半径方向（矢印ｃｄ方向）に沿って延びる環状の面である段差面２５ｓが形成されている。段部２５ａの段差面２５ｓは、段部２５ａの下側（矢印ｂ方向）の境界を画成する面である。段部２５ａの段差面２５ｓは、段差面２５ｓの内周側（矢印ｃ方向）の縁において上側円錐軸受部材２２ａの内周側（矢印ｃ方向）の面である内周面２２ｉと接続している。 The stepped portion 25a of the upper conical bearing member 22a has a radial direction (arrow cd A step surface 25s, which is an annular surface extending along the direction ), is formed. The stepped surface 25s of the stepped portion 25a defines a boundary on the lower side (in the direction of the arrow b) of the stepped portion 25a. A stepped surface 25s of the stepped portion 25a is connected to an inner peripheral surface 22i, which is a surface on the inner peripheral side (arrow c direction) of the upper conical bearing member 22a, at an edge on the inner peripheral side (arrow c direction) of the stepped surface 25s. there is

上側円錐軸受部材２２ａの上面２２ｕと段部２５ａの段差面２５ｓとの間には、外周面２５ｘが形成されている。段部２５ａの外周面２５ｘは、段部２５ａの外周側（矢印ｄ方向）の境界を画成する面である。段部２５ａの外周面２５ｘは、段差面２５ｓの外周側（矢印ｄ方向）の縁から軸方向（矢印ａｂ方向）に沿って上側（矢印ａ方向）に延びる軸Ｙ１を中心とする円筒面状の面である。 An outer peripheral surface 25x is formed between the upper surface 22u of the upper conical bearing member 22a and the stepped surface 25s of the stepped portion 25a. The outer peripheral surface 25x of the stepped portion 25a is a surface that defines a boundary on the outer peripheral side (in the direction of arrow d) of the stepped portion 25a. The outer peripheral surface 25x of the stepped portion 25a has a cylindrical shape centered on an axis Y1 extending upward (in the direction of arrow a) along the axial direction (in the direction of arrow ab) from the edge of the stepped surface 25s on the outer peripheral side (in the direction of arrow d). is the aspect of

上側抜け止め部材２３ａは、例えば、環の一部が切り欠かれた、軸Ｙ１を中心として半径方向（矢印ｃｄ方向）に延びる円環状に形成されている。上側抜け止め部材２３ａの内周側（矢印ｃ方向）の面である内周面２３ｉの半径方向（矢印ｃｄ方向）における長さ（内周面２３ｉの直径）は、軸部材２１の周溝２４の底面２４ｔの半径方向（矢印ｃｄ方向）における長さ（底面２４ｔの直径）よりも小さくなっている。上側抜け止め部材２３ａは、スナップリング（例えば、Ｃリング）である。スナップリングは、閉じていない環状部材であり、弾性変形によって元の内径より大きく開くことが可能であり、これによって元の内径よりも大きな外径の軸部材に嵌め込むことができる（元の内径に戻ろうとする弾性力によって軸部材に固定される）。すなわち、上側抜け止め部材２３ａは、閉じていない環状部材の内側または外側への拡縮動作に対して反発復帰するスプリング作用を有している。 The upper retainer member 23a is formed, for example, in an annular shape with a part of the ring notched and extending in the radial direction (arrow cd direction) about the axis Y1. The length (diameter of the inner peripheral surface 23i) in the radial direction (arrow cd direction) of the inner peripheral surface 23i, which is the surface on the inner peripheral side (arrow c direction) of the upper retaining member 23a, is equal to the circumferential groove 24 of the shaft member 21. is smaller than the length (diameter of the bottom surface 24t) in the radial direction (arrow cd direction) of the bottom surface 24t. The upper retaining member 23a is a snap ring (for example, C-ring). A snap ring is an unclosed annular member that can be opened larger than its original inner diameter by elastic deformation, thereby allowing it to fit onto a shaft member with an outer diameter greater than its original inner diameter (original inner diameter is fixed to the shaft member by the elastic force that tries to return to). That is, the upper retaining member 23a has a spring action that rebounds and returns against the expanding and contracting action of the unclosed annular member inward or outward.

上側円錐軸受部材２２ａ及び上側抜け止め部材２３ａを軸部材２１に組み付けた状態において、上側抜け止め部材２３ａは、段部２５ａにおける一方側（上側（矢印ａ方向））を臨む面（段差面２５ｓ）と当接しており、軸部材２１の周溝２４内において固定されている。軸部材２１の周溝２４における他方側（下側（矢印ｂ方向））を臨む面（下面２４ｂ）と段部２５ａにおける一方側（上側（矢印ａ方向））を臨む面（段差面２５ｓ）とは面一である。軸部材２１の周溝２４と段部２５ａとにより画成される空間Ｓ１には、硬化した接着剤ＡＤが充填されている。 When the upper conical bearing member 22a and the upper retaining member 23a are assembled to the shaft member 21, the upper retaining member 23a faces one side (upper side (direction of arrow a)) of the stepped portion 25a (stepped surface 25s). and fixed in the circumferential groove 24 of the shaft member 21 . A surface (lower surface 24b) facing the other side (lower side (arrow b direction)) of the circumferential groove 24 of the shaft member 21 and a surface (stepped surface 25s) facing the one side (upper side (arrow a direction)) of the stepped portion 25a is flat. A space S1 defined by the circumferential groove 24 and the step portion 25a of the shaft member 21 is filled with a hardened adhesive AD.

具体的に、軸部材２１の外周面２１ｘの半径方向（矢印ｃｄ方向）における長さ（外周面２１ｘの直径）は、上側円錐軸受部材２２ａの内周面２２ｉの半径方向（矢印ｃｄ方向）における長さ（内周面２２ｉの直径）よりも大きくなっており、上側円錐軸受部材２２ａは、軸部材２１に圧入されている。軸部材２１の周溝２４の下面２４ｂは、軸方向（矢印ａｂ方向）において、段部２５ａの段差面２５ｓと同じ位置に位置している。なお、軸部材２１の周溝２４の下面２４ｂは、段部２５ａの段差面２５ｓと異なる位置（例えば、段差面２５ｓに対して上側（矢印ａ方向））に位置していてもよい。 Specifically, the length (diameter of the outer peripheral surface 21x) in the radial direction (arrow cd direction) of the outer peripheral surface 21x of the shaft member 21 is It is larger than the length (the diameter of the inner peripheral surface 22i), and the upper conical bearing member 22a is press-fitted into the shaft member 21. As shown in FIG. The lower surface 24b of the circumferential groove 24 of the shaft member 21 is located at the same position as the stepped surface 25s of the stepped portion 25a in the axial direction (arrow ab direction). Note that the lower surface 24b of the circumferential groove 24 of the shaft member 21 may be located at a position different from the stepped surface 25s of the stepped portion 25a (for example, above the stepped surface 25s (in the direction of arrow a)).

軸部材２１の周溝２４の底面２４ｔの軸方向（矢印ａｂ方向）における長さは、段部２５ａの外周面２５ｘの軸方向（矢印ａｂ方向）における長さと同じ長さとなっており、軸部材２１の周溝２４の上面２４ｕは、軸方向（矢印ａｂ方向）において、上側円錐軸受部材２２ａの上面２２ｕと同じ位置に位置している。なお、軸部材２１の周溝２４の底面２４ｔの長さは、段部２５ａの外周面２５ｘの長さと異なる長さであってもよく、軸部材２１の周溝２４の上面２４ｕは、上側円錐軸受部材２２ａの上面２２ｕと異なる位置（例えば、上面２２ｕに対して上側（矢印ａ方向））に位置していてもよい。 The length in the axial direction (arrow ab direction) of the bottom surface 24t of the circumferential groove 24 of the shaft member 21 is the same as the length in the axial direction (arrow ab direction) of the outer peripheral surface 25x of the stepped portion 25a. The upper surface 24u of the circumferential groove 24 of 21 is located at the same position as the upper surface 22u of the upper conical bearing member 22a in the axial direction (arrow ab direction). Note that the length of the bottom surface 24t of the circumferential groove 24 of the shaft member 21 may be different from the length of the outer peripheral surface 25x of the stepped portion 25a, and the top surface 24u of the circumferential groove 24 of the shaft member 21 is an upper cone. It may be located at a position different from the upper surface 22u of the bearing member 22a (for example, above the upper surface 22u (in the direction of arrow a)).

上側抜け止め部材２３ａは、軸部材２１の周溝２４と段部２５ａとにより画成される空間Ｓ１内において軸部材２１の周溝２４の底面２４ｔに固定されている。空間Ｓ１は、軸部材２１の周溝２４の底面２４ｔ、上面２４ｕ及び下面２４ｂ、並びに段部２５ａの外周面２５ｘ及び段差面２５ｓにより画成されている、半径方向（矢印ｃｄ方向）において所定の幅を有する軸Ｙ１を中心とする円環状の空間である。上側抜け止め部材２３ａの内周面２３ｉは、軸部材２１の周溝２４内の底面２４ｔに当接して軸部材２１の周溝２４内の底面２４ｔを内周側（矢印ｃ方向）に付勢している。 The upper retaining member 23a is fixed to the bottom surface 24t of the circumferential groove 24 of the shaft member 21 within the space S1 defined by the circumferential groove 24 of the shaft member 21 and the stepped portion 25a. The space S1 is defined by a bottom surface 24t, an upper surface 24u and a lower surface 24b of the circumferential groove 24 of the shaft member 21, and an outer peripheral surface 25x and a step surface 25s of the stepped portion 25a. It is an annular space centered on an axis Y1 having a width. The inner peripheral surface 23i of the upper retaining member 23a contacts the bottom surface 24t in the circumferential groove 24 of the shaft member 21 and biases the bottom surface 24t in the circumferential groove 24 of the shaft member 21 toward the inner circumferential side (in the direction of arrow c). is doing.

上側抜け止め部材２３ａの下側（矢印ｂ方向）の面である下面２３ａｂは、少なくとも段部２５ａの段差面２５ｓの一部と当接している。上側抜け止め部材２３ａの下面２３ａｂの半径方向（矢印ｃｄ方向）における長さは、周溝２４の下面２４ｂの半径方向（矢印ｃｄ方向）における長さと段部２５ａの段差面２５ｓの半径方向（矢印ｃｄ方向）における長さとの合計の長さよりも小さくなっている。 A lower surface 23ab, which is a surface on the lower side (in the direction of arrow b) of the upper retaining member 23a, is in contact with at least a portion of the stepped surface 25s of the stepped portion 25a. The length of the lower surface 23ab of the upper retaining member 23a in the radial direction (arrow cd direction) is equal to the length of the lower surface 24b of the circumferential groove 24 in the radial direction (arrow cd direction) and the step surface 25s of the stepped portion 25a in the radial direction (arrow cd direction). cd direction).

このため、段部２５ａの外周面２５ｘと上側抜け止め部材２３ａの外周側（矢印ｄ方向）の面である外周面２３ｘとの間には、半径方向（矢印ｃｄ方向）において所定の幅を有する軸Ｙ１を中心とする円環状の隙間Ｃ１が形成されている。上側抜け止め部材２３ａの内周面２３ｉの軸方向（矢印ａｂ方向）における長さは、周溝２４の底面２４ｔの軸方向（矢印ａｂ方向）における長さ及び段部２５ａの外周面２５ｘの軸方向（矢印ａｂ方向）における長さよりも小さくなっている。 Therefore, there is a predetermined width in the radial direction (arrow cd direction) between the outer peripheral surface 25x of the stepped portion 25a and the outer peripheral surface 23x, which is the surface on the outer peripheral side (arrow d direction) of the upper retaining member 23a. An annular gap C1 is formed around the axis Y1. The length of the inner peripheral surface 23i of the upper retaining member 23a in the axial direction (direction of arrow ab) is equal to the length of the bottom surface 24t of the circumferential groove 24 in the axial direction (direction of arrow ab) and the axis of the outer peripheral surface 25x of the stepped portion 25a. It is smaller than the length in the direction (arrow ab direction).

上側抜け止め部材２３ａは、拡径部（段部２５ａ）に接着剤ＡＤを充填して埋め込まれている。具体的に、硬化した接着剤ＡＤは、軸方向（矢印ａｂ方向）において、軸部材２１の周溝２４と段部２５ａとにより画成される空間Ｓ１内の段部２５ａの段差面２５ｓの位置から上側円錐軸受部材２２ａの上面２２ｕの位置まで充填されている。つまり、硬化した接着剤ＡＤは、段部２５ａの外周面２５ｘと上側抜け止め部材２３ａの外周面２３ｘとの間の隙間Ｃ１、及び軸方向（矢印ａｂ方向）において、上側抜け止め部材２３ａの上側（矢印ａ方向）の面である上面２３ｕの位置から軸部材２１の周溝２４の上面２４ｕまでの位置の空間に充填されており、上側抜け止め部材２３ａを覆っている。接着剤ＡＤには、光硬化又は加熱硬化する樹脂剤（例えば、エポキシ系接着剤）が用いられる。 The upper retaining member 23a is embedded by filling the enlarged diameter portion (stepped portion 25a) with an adhesive AD. Specifically, in the axial direction (arrow ab direction), the hardened adhesive AD is positioned at the stepped surface 25s of the stepped portion 25a within the space S1 defined by the circumferential groove 24 of the shaft member 21 and the stepped portion 25a. to the upper surface 22u of the upper conical bearing member 22a. That is, the hardened adhesive AD spreads over the upper side of the upper retaining member 23a in the gap C1 between the outer peripheral surface 25x of the stepped portion 25a and the outer peripheral surface 23x of the upper retaining member 23a and in the axial direction (arrow ab direction). It is filled in the space from the position of the upper surface 23u, which is the surface (in the direction of the arrow a) to the upper surface 24u of the circumferential groove 24 of the shaft member 21, and covers the upper retaining member 23a. As the adhesive AD, a photocurable or heat-curable resin agent (for example, an epoxy adhesive) is used.

なお、下側円錐軸受部材２２ｂ及び下側抜け止め部材２３ｂの具体的な構成については、上側円錐軸受部材２２ａ及び上側抜け止め部材２３ａと同様であるため、記載を省略する。また、軸部材２１の周溝２４は、上述したような上側円錐軸受部材２２ａ及び上側抜け止め部材２３ａに対応した位置に形成されているのと同様に、下側円錐軸受部材２２ｂ及び下側抜け止め部材２３ｂに対応する位置にも形成されている。また、下側円錐軸受部材２２ｂ及び下側抜け止め部材２３ｂを軸部材２１に組み付けた状態については、上側円錐軸受部材２２ａ及び上側抜け止め部材２３ａを軸部材２１に組み付けた状態と同様であるため、記載を省略する。 The specific configurations of the lower conical bearing member 22b and the lower retainer member 23b are the same as those of the upper conical bearing member 22a and the upper retainer member 23a, and therefore description thereof is omitted. Further, the circumferential groove 24 of the shaft member 21 is formed at a position corresponding to the upper conical bearing member 22a and the upper retaining member 23a as described above. It is also formed at a position corresponding to the stop member 23b. Also, the state in which the lower conical bearing member 22b and the lower retaining member 23b are assembled to the shaft member 21 is the same as the state in which the upper conical bearing member 22a and the upper retaining member 23a are assembled to the shaft member 21. , description is omitted.

このように、本発明の実施の形態に係るスピンドルモータ１は、軸ユニット２０が、軸部材２１と、軸部材２１に挿通された上側円錐軸受部材２２ａ及び下側円錐軸受部材２２ｂと、上側円錐軸受部材２２ａ及び下側円錐軸受部材２２ｂと軸方向（矢印ａｂ方向）において当接しており、軸部材２１に固定された上側抜け止め部材２３ａ及び下側抜け止め部材２３ｂとを備えている。上側抜け止め部材２３ａ及び下側抜け止め部材２３ｂにより上側円錐軸受部材２２ａ及び下側円錐軸受部材２２ｂにおける軸方向（矢印ａｂ方向）の移動が規制されている。 Thus, in the spindle motor 1 according to the embodiment of the present invention, the shaft unit 20 includes the shaft member 21, the upper conical bearing member 22a and the lower conical bearing member 22b inserted through the shaft member 21, and the upper conical bearing member 22b. It abuts on the bearing member 22a and the lower conical bearing member 22b in the axial direction (arrow ab direction) and is provided with an upper retaining member 23a and a lower retaining member 23b fixed to the shaft member 21 . The movement of the upper conical bearing member 22a and the lower conical bearing member 22b in the axial direction (arrow ab direction) is restricted by the upper retaining member 23a and the lower retaining member 23b.

このため、軸部材２１に固定された上側抜け止め部材２３ａ及び下側抜け止め部材２３ｂにより軸部材２１と上側円錐軸受部材２２ａ及び下側円錐軸受部材２２ｂとが固定されている。したがって、軸部材２１と上側円錐軸受部材２２ａ及び下側円錐軸受部材２２ｂとの間の外部衝撃に対する耐力を向上することができる。また、上側円錐軸受部材２２ａ及び下側円錐軸受部材２２ｂを軸部材２１に強く圧入して固定する必要がないため、上側円錐軸受部材２２ａ及び下側円錐軸受部材２２ｂの変形を防止することができ、スピンドルモータ１の回転駆動時における上側円錐軸受部材２２ａ及び下側円錐軸受部材２２ｂの変形に伴う振動を防止することができる。 Therefore, the shaft member 21 and the upper conical bearing member 22a and the lower conical bearing member 22b are fixed by the upper retaining member 23a and the lower retaining member 23b fixed to the shaft member 21, respectively. Therefore, it is possible to improve the strength against external impact between the shaft member 21 and the upper conical bearing member 22a and the lower conical bearing member 22b. Moreover, since it is not necessary to press-fit and fix the upper conical bearing member 22a and the lower conical bearing member 22b to the shaft member 21, deformation of the upper conical bearing member 22a and the lower conical bearing member 22b can be prevented. , vibration accompanying deformation of the upper conical bearing member 22a and the lower conical bearing member 22b when the spindle motor 1 is rotationally driven can be prevented.

また、本発明の実施の形態に係るスピンドルモータ１は、上側円錐軸受部材２２ａ及び上側抜け止め部材２３ａを軸部材２１に組み付け、下側円錐軸受部材２２ｂ及び下側抜け止め部材２３ｂを軸部材２１に組み付けた状態において、上側抜け止め部材２３ａ及び下側抜け止め部材２３ｂが、段部２５ａの段差面２５ｓと当接しており、軸部材２１の周溝２４内において固定されている。このため、軸部材２１の周溝２４が上側抜け止め部材２３ａ及び下側抜け止め部材２３ｂに対して軸方向（矢印ａｂ方向）におけるストッパの機能を果たすため、軸部材２１と上側円錐軸受部材２２ａ及び下側円錐軸受部材２２ｂとの間の外部衝撃に対する耐力を更に向上することができる。 Further, in the spindle motor 1 according to the embodiment of the present invention, the upper conical bearing member 22a and the upper retaining member 23a are assembled to the shaft member 21, and the lower conical bearing member 22b and the lower retaining member 23b are attached to the shaft member 21. 2, the upper retaining member 23a and the lower retaining member 23b are in contact with the stepped surface 25s of the stepped portion 25a and are fixed in the circumferential groove 24 of the shaft member 21. As shown in FIG. Therefore, since the circumferential groove 24 of the shaft member 21 functions as a stopper in the axial direction (direction of arrow ab) for the upper retainer member 23a and the lower retainer member 23b, the shaft member 21 and the upper conical bearing member 22a are separated from each other. and the lower conical bearing member 22b, the resistance to external impact can be further improved.

また、本発明の実施の形態に係るスピンドルモータ１は、軸部材２１の周溝２４と段部２５ａとにより画成される空間Ｓ１に硬化した接着剤ＡＤが充填されている。このため、硬化した接着剤ＡＤが上側抜け止め部材２３ａ及び下側抜け止め部材２３ｂを覆っており、軸部材２１の周溝２４と段部２５ａとにより画成される空間Ｓ１内において充填剤の機能を果たすため、軸部材２１と上側円錐軸受部材２２ａ及び下側円錐軸受部材２２ｂとの間の外部衝撃に対する耐力を更に向上することができる。 Further, in the spindle motor 1 according to the embodiment of the present invention, the space S1 defined by the circumferential groove 24 of the shaft member 21 and the stepped portion 25a is filled with the cured adhesive AD. For this reason, the hardened adhesive AD covers the upper retainer member 23a and the lower retainer member 23b, and the filler does not flow in the space S1 defined by the circumferential groove 24 of the shaft member 21 and the stepped portion 25a. As a result, the resistance to external shocks between the shaft member 21 and the upper conical bearing member 22a and the lower conical bearing member 22b can be further improved.

上述のように、本発明の実施の形態に係るスピンドルモータ１によれば、上側円錐軸受部材２２ａ及び下側円錐軸受部材２２ｂの変形を防止しつつ、上側円錐軸受部材２２ａ及び下側円錐軸受部材２２ｂと軸部材２１との間の締結強度を向上することができる。 As described above, according to the spindle motor 1 according to the embodiment of the present invention, deformation of the upper conical bearing member 22a and the lower conical bearing member 22b is prevented while the upper conical bearing member 22a and the lower conical bearing member 22b are prevented from deforming. The fastening strength between 22b and the shaft member 21 can be improved.

以上、本発明の実施の形態について説明したが、本発明は上記実施の形態に限定されるものではなく、本発明の概念及び特許請求の範囲に含まれるあらゆる態様を含む。また、上述した課題及び効果の少なくとも一部を奏するように、各構成を適宜選択的に組み合わせてもよい。例えば、上記実施の形態における、各構成要素の形状、材料、配置、サイズ等は、本発明の具体的使用態様によって適宜変更され得る。 Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and includes all aspects included in the concept of the present invention and the scope of claims. Moreover, each configuration may be selectively combined as appropriate so as to achieve at least part of the above-described problems and effects. For example, the shape, material, arrangement, size, etc. of each component in the above embodiment may be changed as appropriate according to the specific usage of the present invention.

例えば、本発明の実施の形態に係るスピンドルモータ１においては、上側抜け止め部材２３ａにより上側円錐軸受部材２２ａにおける軸方向（矢印ａｂ方向）の移動が規制されている場合を一例に本発明の実施の形態について説明した。本発明はこれに限らず、例えば、図４に示すように、軸部材２１の周溝２４の下面２４ｂと段部２５ａの段差面２５ｓとの間に溶接部２６が形成されていてもよい。 For example, in the spindle motor 1 according to the embodiment of the present invention, the upper conical bearing member 22a is restricted from moving in the axial direction (arrow ab direction) by the upper retaining member 23a. described the form of The present invention is not limited to this. For example, as shown in FIG. 4, a welded portion 26 may be formed between the lower surface 24b of the circumferential groove 24 of the shaft member 21 and the stepped surface 25s of the stepped portion 25a.

図４は、図２に示すスピンドルモータ１の上側（矢印ａ方向）の部分の変形例の構成を概略的に示す部分拡大断面図である。溶接部２６は、軸部材２１の周溝２４の下面２４ｂと段部２５ａの段差面２５ｓとの間において軸Ｙ１を中心とする円環状に溶接されて形成されている。このように、本発明の実施の形態の変形例に係るスピンドルモータ１は、軸部材２１の周溝２４の下面２４ｂと段部２５ａの段差面２５ｓとの間に溶接部２６が形成されている。このため、軸部材２１に固定された上側抜け止め部材２３ａ及び溶接部２６により軸部材２１と上側円錐軸受部材２２ａとが固定されているため、軸部材２１と上側円錐軸受部材２２ａとの間の外部衝撃に対する耐力を更に向上することができる。また、スピンドルモータ１の下側（矢印ｂ方向）の部分においても、上述の場合と同様に、軸部材２１の周溝２４と下側円錐軸受部材２２ｂの段部との間に溶接部を形成することができる。 FIG. 4 is a partially enlarged cross-sectional view schematically showing a modified configuration of the upper side (in the direction of arrow a) of the spindle motor 1 shown in FIG. The welded portion 26 is formed by welding between the lower surface 24b of the circumferential groove 24 of the shaft member 21 and the stepped surface 25s of the stepped portion 25a in an annular shape about the axis Y1. Thus, in the spindle motor 1 according to the modification of the embodiment of the present invention, the welded portion 26 is formed between the lower surface 24b of the circumferential groove 24 of the shaft member 21 and the stepped surface 25s of the stepped portion 25a. . Therefore, since the shaft member 21 and the upper conical bearing member 22a are fixed by the upper retaining member 23a fixed to the shaft member 21 and the welded portion 26, there is no gap between the shaft member 21 and the upper conical bearing member 22a. It is possible to further improve resistance to external impact. Also, in the lower side (in the direction of the arrow b) of the spindle motor 1, a welded portion is formed between the circumferential groove 24 of the shaft member 21 and the stepped portion of the lower conical bearing member 22b, as in the case described above. can do.

また、本発明の実施の形態に係るスピンドルモータ１においては、軸部材２１が、軸部材２１の外周面２１ｘから内周側（矢印ｃ方向）に凹む周溝２４を有している場合を一例に本発明の実施の形態について説明した。本発明はこれに限らず、例えば、図５に示すように、周溝２４を有していなくてもよく、上側抜け止め部材２３ａの代わりに円環状に形成された上側抜け止め部材２７ａを有していてもよい。 Further, in the spindle motor 1 according to the embodiment of the present invention, the case where the shaft member 21 has the circumferential groove 24 recessed from the outer circumferential surface 21x of the shaft member 21 to the inner circumferential side (in the direction of the arrow c) is taken as an example. The embodiments of the present invention have been described. The present invention is not limited to this. For example, as shown in FIG. You may have

図５は、図２に示すスピンドルモータ１の上側（矢印ａ方向）の部分の変形例の構成を概略的に示す部分拡大断面図である。上側円錐軸受部材２２ａは、上側円錐軸受部材２２ａの内周側（矢印ｃ方向）において上側円錐軸受部材２２ａの上面２２ｕから下側（矢印ｂ方向）に凹む段部２５ａを有している。上側抜け止め部材２７ａは、上側円錐軸受部材２２ａの段部２５ａにおける一方側（上側（矢印ａ方向））を臨む面（段差面２５ｓ）と当接しており、軸部材２１に固定されている。上側抜け止め部材２７ａは、例えば、リング部材であり、軸部材２１に圧入されている。軸部材２１と段部２５ａとにより画成される空間Ｓ２には、硬化した接着剤ＡＤが充填されている。 FIG. 5 is a partially enlarged cross-sectional view schematically showing a modified configuration of the upper side (in the direction of the arrow a) of the spindle motor 1 shown in FIG. The upper conical bearing member 22a has a stepped portion 25a recessed downward (in the direction of arrow b) from the upper surface 22u of the upper conical bearing member 22a on the inner peripheral side (in the direction of arrow c) of the upper conical bearing member 22a. The upper retaining member 27a is in contact with a surface (stepped surface 25s) facing one side (upper side (arrow a direction)) of the stepped portion 25a of the upper conical bearing member 22a and is fixed to the shaft member 21 . The upper retaining member 27a is, for example, a ring member and is press-fitted into the shaft member 21. As shown in FIG. A space S2 defined by the shaft member 21 and the stepped portion 25a is filled with a cured adhesive AD.

具体的に、上側抜け止め部材２７ａは、例えば、軸Ｙ１を中心として半径方向（矢印ｃｄ方向）に延びる円環状に形成されている。上側抜け止め部材２７ａの内周側（矢印ｃ方向）の面である内周面２７ｉの半径方向（矢印ｃｄ方向）における長さ（内周面２７ｉの直径）は、軸部材２１の外周面２１ｘの半径方向（矢印ｃｄ方向）における長さ（軸部材２１の直径）よりも小さくなっている。 Specifically, the upper retaining member 27a is, for example, formed in an annular shape extending radially (in the direction of the arrow cd) about the axis Y1. The length (diameter of the inner peripheral surface 27i) in the radial direction (arrow cd direction) of the inner peripheral surface 27i, which is the surface on the inner peripheral side (arrow c direction) of the upper retaining member 27a, is equal to the outer peripheral surface 21x of the shaft member 21. (the diameter of the shaft member 21) in the radial direction (arrow cd direction).

上側円錐軸受部材２２ａ及び上側抜け止め部材２７ａを軸部材２１に組み付けた状態において、上側抜け止め部材２７ａは、軸部材２１と段部２５ａとにより画成される空間Ｓ２内において軸部材２１に固定されている。空間Ｓ２は、軸部材２１の外周面２１ｘ、並びに段部２５ａの外周面２５ｘ及び段差面２５ｓにより画成されている、半径方向（矢印ｃｄ方向）において所定の幅を有する軸Ｙ１を中心とする円環状の空間である。上側抜け止め部材２７ａの内周面２７ｉは、軸部材２１に上側円錐軸受部材２２aよりも強く圧入されている。 When the upper conical bearing member 22a and the upper retaining member 27a are assembled to the shaft member 21, the upper retaining member 27a is fixed to the shaft member 21 within the space S2 defined by the shaft member 21 and the stepped portion 25a. It is The space S2 is defined by the outer peripheral surface 21x of the shaft member 21, the outer peripheral surface 25x of the stepped portion 25a, and the stepped surface 25s, and is centered on the axis Y1 having a predetermined width in the radial direction (arrow cd direction). It is an annular space. An inner peripheral surface 27i of the upper retaining member 27a is press-fitted into the shaft member 21 more strongly than the upper conical bearing member 22a.

上側抜け止め部材２７ａの下側（矢印ｂ方向）の面である下面２７ａｂは、段部２５ａの段差面２５ｓの一部と当接している。上側抜け止め部材２７ａの下面２７ａｂの半径方向（矢印ｃｄ方向）における長さは、段部２５ａの段差面２５ｓの半径方向（矢印ｃｄ方向）における長さよりも小さくなっている。このため、段部２５ａの外周面２５ｘと上側抜け止め部材２７ａの外周側（矢印ｄ方向）の面である外周面２７ｘとの間には、半径方向（矢印ｃｄ方向）において所定の幅を有する軸Ｙ１を中心とする円環状の隙間Ｃ２が形成されている。上側抜け止め部材２７ａの内周面２７ｉの軸方向（矢印ａｂ方向）における長さは、段部２５ａの外周面２５ｘの軸方向（矢印ａｂ方向）における長さよりも小さくなっている。 A lower surface 27ab, which is a surface on the lower side (in the direction of the arrow b) of the upper retaining member 27a, is in contact with part of the stepped surface 25s of the stepped portion 25a. The length of the lower surface 27ab of the upper retaining member 27a in the radial direction (direction of arrow cd) is smaller than the length of the step surface 25s of the stepped portion 25a in the radial direction (direction of arrow cd). Therefore, there is a predetermined width in the radial direction (arrow cd direction) between the outer peripheral surface 25x of the stepped portion 25a and the outer peripheral surface 27x, which is the surface on the outer peripheral side (arrow d direction) of the upper retaining member 27a. An annular gap C2 is formed around the axis Y1. The length of the inner peripheral surface 27i of the upper retaining member 27a in the axial direction (arrow ab direction) is smaller than the length of the outer peripheral surface 25x of the stepped portion 25a in the axial direction (arrow ab direction).

硬化した接着剤ＡＤは、段部２５ａの外周面２５ｘと上側抜け止め部材２７ａの外周面２７ｘとの間の隙間Ｃ２、及び軸方向（矢印ａｂ方向）において、上側抜け止め部材２７ａの上側（矢印ａ方向）の面である上面２７ｕの位置から上側円錐軸受部材２２ａの上面２２ｕまでの位置の空間に充填されており、上側抜け止め部材２７ａを覆っている。 The hardened adhesive AD spreads over the upper side of the upper retaining member 27a (arrow It is filled in the space from the position of the upper surface 27u, which is the surface in the a direction) to the upper surface 22u of the upper conical bearing member 22a, and covers the upper retaining member 27a.

このように、本発明の実施の形態の変形例に係るスピンドルモータ１は、上側抜け止め部材２７ａが、上側円錐軸受部材２２ａの段部２５ａの段差面２５ｓと当接しており、軸部材２１に固定されている。このため、軸部材２１に固定された上側抜け止め部材２７ａにより軸部材２１と上側円錐軸受部材２２ａとが固定されているため、軸部材２１と上側円錐軸受部材２２ａとの間の外部衝撃に対する耐力を更に向上することができる。 Thus, in the spindle motor 1 according to the modification of the embodiment of the present invention, the upper retainer member 27a abuts on the stepped surface 25s of the stepped portion 25a of the upper conical bearing member 22a. Fixed. Therefore, since the shaft member 21 and the upper conical bearing member 22a are fixed by the upper retainer member 27a fixed to the shaft member 21, the resistance to external impact between the shaft member 21 and the upper conical bearing member 22a is increased. can be further improved.

また、本発明の実施の形態に係るスピンドルモータ１においては、軸部材２１が周溝２４を有しており、上側円錐軸受部材２２ａが段部２５ａを有している場合を一例に本発明の実施の形態について説明した。本発明はこれに限らず、例えば、図６に示すように、周溝２４及び段部２５ａを有していなくてもよく、上側抜け止め部材２３ａの代わりに円環状に形成された上側抜け止め部材２８ａを有していてもよい。 Further, in the spindle motor 1 according to the embodiment of the present invention, the case where the shaft member 21 has the circumferential groove 24 and the upper conical bearing member 22a has the stepped portion 25a is taken as an example. Embodiments have been described. The present invention is not limited to this. For example, as shown in FIG. It may have a member 28a.

図６は、図２に示すスピンドルモータ１の上側（矢印ａ方向）の部分の変形例の構成を概略的に示す部分拡大断面図である。上側抜け止め部材２８ａは、上側円錐軸受部材２２ａの上面２２ｕと当接しており、軸部材２１に固定されている。上側抜け止め部材２８ａは、例えば、閉じた環状部材であり、軸部材２１に上側円錐軸受部材２２ａよりも強く圧入されている。 FIG. 6 is a partially enlarged cross-sectional view schematically showing a modified configuration of the upper side (in the direction of the arrow a) of the spindle motor 1 shown in FIG. The upper retaining member 28 a is in contact with the upper surface 22 u of the upper conical bearing member 22 a and fixed to the shaft member 21 . The upper retaining member 28a is, for example, a closed annular member, and is press-fitted into the shaft member 21 more strongly than the upper conical bearing member 22a.

具体的に、上側抜け止め部材２８ａは、例えば、軸Ｙ１を中心として半径方向（矢印ｃｄ方向）に延びる円環状に形成されている。上側抜け止め部材２８ａの内周側（矢印ｃ方向）の面である内周面２８ｉの半径方向（矢印ｃｄ方向）における長さ（内周面２８ｉの直径）は、軸部材２１の外周面２１ｘの半径方向（矢印ｃｄ方向）における長さ（軸部材２１の直径）よりも小さくなっている。上側抜け止め部材２８ａの外周側（矢印ｄ方向）の面である外周面２８ｘは、上側抜け止め部材２８ａの上側（矢印ａ方向）の面である上面２８ｕの外周側（矢印ｄ方向）の縁から下側（矢印ｂ方向）に向かうにつれて外周側（矢印ｄ方向）に拡径する軸Ｙ１を中心とする円錐筒状のテーパ面である。 Specifically, the upper retainer member 28a is formed, for example, in an annular shape extending in the radial direction (arrow cd direction) about the axis Y1. The length (diameter of the inner peripheral surface 28i) in the radial direction (arrow cd direction) of the inner peripheral surface 28i, which is the surface on the inner peripheral side (arrow c direction) of the upper retaining member 28a, is equal to the outer peripheral surface 21x of the shaft member 21. (the diameter of the shaft member 21) in the radial direction (arrow cd direction). The outer peripheral surface 28x, which is the surface on the outer peripheral side (direction of arrow d) of the upper retaining member 28a, is the edge of the outer peripheral side (direction of arrow d) of the upper surface 28u, which is the surface on the upper side (direction of arrow a) of the upper retaining member 28a. It is a conical cylindrical tapered surface centered on the axis Y1 that expands in diameter toward the outer peripheral side (arrow d direction) as it goes downward (arrow b direction).

上側円錐軸受部材２２ａ及び上側抜け止め部材２８ａを軸部材２１に組み付けた状態において、上側抜け止め部材２８ａは、上側円錐軸受部材２２ａの上面２２ｕの上側（矢印ａ方向）において軸部材２１に固定されている。上側抜け止め部材２８ａの内周面２８ｉは、軸部材２１に圧入されている。上側抜け止め部材２８ａの下側（矢印ｂ方向）の面である下面２８ａｂは、上側円錐軸受部材２２ａの上面２２ｕと当接している。上側抜け止め部材２８ａの下面２８ａｂの半径方向（矢印ｃｄ方向）における長さは、上側円錐軸受部材２２ａの上面２２ｕの半径方向（矢印ｃｄ方向）における長さと同じ長さとなっている。また、上側抜け止め部材２８ａの外周面２８ｘの傾きは、上側円錐軸受部材２２ａの上側（矢印ａ方向）の外周面である上側円錐外面２２ａｕの傾きと同じ傾きになっている。このため、上側抜け止め部材２８ａの外周面２８ｘは、上側円錐軸受部材２２ａの上側円錐外面２２ａｕと面一になっている。 When the upper conical bearing member 22a and the upper retaining member 28a are assembled to the shaft member 21, the upper retaining member 28a is fixed to the shaft member 21 above the upper surface 22u of the upper conical bearing member 22a (in the direction of arrow a). ing. An inner peripheral surface 28 i of the upper retaining member 28 a is press-fitted into the shaft member 21 . A lower surface 28ab, which is a surface on the lower side (in the direction of arrow b) of the upper retaining member 28a, abuts on the upper surface 22u of the upper conical bearing member 22a. The length in the radial direction (direction of arrow cd) of the lower surface 28ab of the upper retaining member 28a is the same as the length in the radial direction (direction of arrow cd) of the upper surface 22u of the upper conical bearing member 22a. Further, the inclination of the outer peripheral surface 28x of the upper retaining member 28a is the same as the inclination of the upper conical outer surface 22au, which is the outer peripheral surface on the upper side (in the direction of arrow a) of the upper conical bearing member 22a. Therefore, the outer peripheral surface 28x of the upper retaining member 28a is flush with the upper conical outer surface 22au of the upper conical bearing member 22a.

このように、本発明の実施の形態の変形例に係るスピンドルモータ１は、上側抜け止め部材２８ａが、上側円錐軸受部材２２ａの上面２２ｕと当接しており、軸部材２１に固定されている。このため、軸部材２１に固定された上側抜け止め部材２８ａにより軸部材２１と上側円錐軸受部材２２ａとが固定されているため、軸部材２１と上側円錐軸受部材２２ａとの間の外部衝撃に対する耐力を更に向上することができる。 As described above, in the spindle motor 1 according to the modification of the embodiment of the present invention, the upper retaining member 28a is in contact with the upper surface 22u of the upper conical bearing member 22a and is fixed to the shaft member 21. Therefore, since the shaft member 21 and the upper conical bearing member 22a are fixed by the upper retainer member 28a fixed to the shaft member 21, the resistance against external impact between the shaft member 21 and the upper conical bearing member 22a is increased. can be further improved.

また、本発明の実施の形態に係るスピンドルモータ１においては、硬化した接着剤ＡＤが、軸方向（矢印ａｂ方向）において、空間Ｓ１内の段部２５ａの段差面２５ｓの位置から上側円錐軸受部材２２ａの上面２２ｕの位置まで充填されている場合を一例に本発明の実施の形態について説明した。本発明はこれに限らず、例えば、図７に示すように、周溝２４の軸方向一端側（上側（矢印ａ方向））の内壁面（上面２４ｕ）と、内壁面（上面２４ｕ）と対向する上側抜け止め部材２３ａの表面（上面２３ｕ）との間の隙間に、接着剤ＡＤが塗布されていればよい。 Further, in the spindle motor 1 according to the embodiment of the present invention, the hardened adhesive AD spreads from the position of the stepped surface 25s of the stepped portion 25a in the space S1 to the upper conical bearing member in the axial direction (arrow ab direction). The embodiment of the present invention has been described by taking as an example the case where the filling is performed up to the position of the upper surface 22u of 22a. The present invention is not limited to this, for example, as shown in FIG. It is sufficient that the adhesive AD is applied to the gap between the upper retaining member 23a and the surface (upper surface 23u) of the upper retaining member 23a.

また、本発明の実施の形態に係るスピンドルモータ１においては、上側抜け止め部材２７ａ及び上側抜け止め部材２８ａを有している場合を一例に本発明の実施の形態について説明した。本発明はこれに限らず、上側抜け止め部材２７ａ及び上側抜け止め部材２８ａと同様の機能を有する下側抜け止め部材を有していてもよい。 Further, in the spindle motor 1 according to the embodiment of the present invention, the embodiment of the present invention has been described by taking as an example the case where the upper retaining member 27a and the upper retaining member 28a are provided. The present invention is not limited to this, and may include a lower retaining member having the same function as the upper retaining member 27a and the upper retaining member 28a.

このような場合であっても、上側抜け止め部材２７ａ及び上側抜け止め部材２８ａと同様の機能を有する下側抜け止め部材により軸部材２１と下側円錐軸受部材２２ｂとが固定されているため、軸部材２１と下側円錐軸受部材２２ｂとの間の外部衝撃に対する耐力を更に向上することができる。 Even in such a case, since the shaft member 21 and the lower conical bearing member 22b are fixed by the lower retaining member having the same function as the upper retaining member 27a and the upper retaining member 28a, It is possible to further improve the resistance to external impact between the shaft member 21 and the lower conical bearing member 22b.

１…スピンドルモータ、１０…ステータ、１１…ベースプレート、１１ａ…貫通孔、１１ｂ…円周壁部、１２…ステータコア、１３…コイル、２０…軸ユニット、２１…軸部材、２１ａ…軸孔、２１ｕ…上側端部、２１ｘ…外周面、２２ａ…上側円錐軸受部材、２２ｂ…下側円錐軸受部材、２２ａｂ…下側円錐外面、２２ａｕ，２２ｂｕ…上側円錐外面、２２ｉ…内周面、２２ｕ…上面、２３ａ，２７ａ，２８ａ…上側抜け止め部材、２３ａｂ，２７ａｂ，２８ａｂ…下面、２３ｉ，２７ｉ，２８ｉ…内周面、２３ｕ，２７ｕ，２８ｕ…上面、２３ｘ，２７ｘ，２８ｘ…外周面、２３ｂ，２７ｂ，２８ｂ…下側抜け止め部材、２４…周溝、２４ｂ…下面、２４ｔ…底面、２４ｕ…上面、２５…軸受貫通孔、２５ａ…段部、２５ｓ…段差面、２５ｘ…外周面、２６…溶接部、３０…ロータ、３１…ロータ部材、３１ａ…貫通孔、３１ｂ…動圧溝部、３１ｃ…ヨーク取付部、３１ｄ…円錐内面、３２…ヨーク、３３…ロータマグネット、３４…エンドキャップ、１００…ハードディスク駆動装置、１０１…ハウジング、１０１ａ…底部、１０２…磁気ディスク、１０３…軸受装置、１０４…スイングアーム、１０５…磁気ヘッド、ＡＤ…接着剤、Ｃ１，Ｃ２…隙間、Ｄ…動圧溝、Ｇ…潤滑油、Ｓ，Ｓ１，Ｓ２…空間、Ｙ１…軸 DESCRIPTION OF SYMBOLS 1... Spindle motor 10... Stator 11... Base plate 11a... Through hole 11b... Circumferential wall part 12... Stator core 13... Coil 20... Shaft unit 21... Shaft member 21a... Shaft hole 21u... Upper side end 21x outer peripheral surface 22a upper conical bearing member 22b lower conical bearing member 22ab lower conical outer surface 22au, 22bu upper conical outer surface 22i inner peripheral surface 22u upper surface 23a, 27a, 28a... upper retaining member, 23ab, 27ab, 28ab... lower surface, 23i, 27i, 28i... inner peripheral surface, 23u, 27u, 28u... upper surface, 23x, 27x, 28x... outer peripheral surface, 23b, 27b, 28b... Lower retaining member 24 Peripheral groove 24b Lower surface 24t Bottom surface 24u Upper surface 25 Bearing through hole 25a Stepped portion 25s Stepped surface 25x Peripheral surface 26 Welded portion 30 ... Rotor 31 ... Rotor member 31a ... Through hole 31b ... Dynamic pressure groove portion 31c ... Yoke mounting portion 31d ... Conical inner surface 32 ... Yoke 33 ... Rotor magnet 34 ... End cap 100 ... Hard disk drive, DESCRIPTION OF SYMBOLS 101... Housing, 101a... Bottom part, 102... Magnetic disk, 103... Bearing device, 104... Swing arm, 105... Magnetic head, AD... Adhesive, C1, C2... Gap, D... Dynamic pressure groove, G... Lubricating oil, S, S1, S2... Space, Y1... Axis

Claims (3)

ベースプレートに固定された軸部材と、
軸方向一端側に向かって内径が拡大する円錐内面を有して前記軸部材が挿通された貫通孔を備えるロータ部材と、
前記円錐内面と対向する円錐外面を有して前記軸部材に固定された円錐軸受部材と、
前記円錐内面と前記円錐外面との少なくともいずれかに形成された動圧溝と、
前記円錐内面と前記円錐外面との隙間に充填された潤滑油と、
前記軸方向一端側で前記円錐軸受部材に当接して固定された抜け止め部材と
を備え、
前記円錐軸受部材は、前記軸部材が挿通され、前記軸方向一端側に拡径部を有する軸受貫通孔を備え、
前記軸部材は、前記軸部材の外周面に形成された周溝を備え、
前記抜け止め部材は、前記拡径部に収容され、前記抜け止め部材の下面が前記拡径部の段差面および前記周溝の下面に当接した状態において、前記拡径部に接着剤を充填して埋め込まれて前記軸部材に固定されていることを特徴とするスピンドルモータ。 a shaft member fixed to the base plate;
a rotor member having a through hole having a conical inner surface whose inner diameter increases toward one end in the axial direction and through which the shaft member is inserted;
a conical bearing member having a conical outer surface facing the conical inner surface and fixed to the shaft member;
a dynamic pressure groove formed in at least one of the conical inner surface and the conical outer surface;
lubricating oil filled in the gap between the inner surface of the cone and the outer surface of the cone;
a retainer member fixed in contact with the conical bearing member at one end in the axial direction,
The conical bearing member has a bearing through hole through which the shaft member is inserted and which has an enlarged diameter portion on one end side in the axial direction,
The shaft member has a circumferential groove formed on the outer peripheral surface of the shaft member,
The retaining member is accommodated in the enlarged diameter portion, and adhesive is applied to the enlarged diameter portion in a state in which the lower surface of the retaining member is in contact with the stepped surface of the enlarged diameter portion and the lower surface of the circumferential groove. and fixed to the shaft member. 前記抜け止め部材は、スナップリングであることを特徴とする請求項１記載のスピンドルモータ。 2. The spindle motor according to claim 1, wherein said retaining member is a snap ring. 前記周溝の前記内壁面と前記拡径部の段差面との間に溶接部が形成されていることを特徴とする請求項１記載のスピンドルモータ。 2. The spindle motor according to claim 1, wherein a welded portion is formed between the inner wall surface of the circumferential groove and the stepped surface of the enlarged diameter portion.
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Publication number Priority date Publication date Assignee Title
JP2005308140A (en) 2004-04-23 2005-11-04 Ferrotec Corp Externally or internally binding structure in spindle motor, and spindle motor or disk drive device using the structure
JP2017108543A (en) 2015-12-10 2017-06-15 日本電産株式会社 Spindle motor

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